<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form onsubmit="return false">
        <textarea name="message" style="height: 300px;width: 300px;"></textarea>
        <input type="button" value="发送消息" onclick="send(this.form.message.value)" />
        <textarea id="responseText" style="height: 300px;width: 300px;"></textarea>
        <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''">

    </form>
<script>
    var socket;
    if(window.WebSocket){
        socket = new WebSocket("ws://localhost:7000/hello");
        socket.onmessage = function(ev){
            var rt = document.getElementById("responseText");
            rt.value = rt.value+"\t"+ev.data;
        }
        //相当于连接开启
        socket.onopen = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = "连接开启了";
        }
        //连接关闭
        socket.onclose = function (ev) {
            var rt = document.getElementById("responseText");
            rt.value = rt.value +"\n"+"连接关闭了";
        }
    }else{
        alert("当前浏览器不支持websocket")
    }
    //发送消息到服务器
    function send(message) {
        if(!window.socket){
            return;
        }
        if(socket.readyState == WebSocket.OPEN){
            socket.send(message);
        }else{
            alert("连接没有开启");
        }
    }
</script>
</body>
</html>